How to delete the overlapped vertices in a 3D model?
Solving with &quot;Keep UV and edit mode mesh selection in sync&quot; Option
In the UV Editor window, if you enable the Keep UV and edit mode mesh selection in sync option , then the vertices you select in the UV Editor will also be selected in the 3D edit window.
The location of Keep UV and edit mode mesh selection in sync:


Action Demo
You can then go to the 3D window and delete them.
Don't forget to disable the Keep UV and edit mode mesh selection in sync option afterwards.